Stonington, CT 02804 Frost Dates
Frost dates for Stonington, CT, ZIP 02804
The last spring frost here typically falls around 04/11, about 226 days from today. The first fall frost typically arrives around 10/31, about 201 frost-free days later.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Stonington, not a forecast for this year.
What to do before the first frost
Zone 6b around Stonington has about 9 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
04/11 is the middle of 30 years of NOAA records, not a promise. Plant by 03/31 and you're betting against frost in roughly 9 years out of 10. 04/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Stonington compares
Stonington's growing season runs about 201 days, ranking 17,584 of 40,283 US ZIP codes measured here, longest to shortest. Within CT, it ranks 33 of 391.
Learn more
the frost range explains how to read the range around Stonington's dates instead of trusting one, and local microclimates explains what one yard in Stonington can differ from the 02804 normal.